Blood+ (「ブラッド プラス」 Buraddo Purasu) is an anime television series produced by Production I.G and Aniplex and directed by Junichi Fujisaku. The series originally aired in Japan between October 8, 2005 and September 23, 2006, consisting of 50 episodes. The series aired in North America between March 11, 2007 and March 23, 2008.
Saya Otonashi is a seemingly ordinary girl living a mundane life with her adoptive family in Okinawa City. In fact, her only peculiarities are suffering from anemia and being unable to remember any of her life beyond the previous year. However, Saya's forgotten past quickly comes back to haunt her—one night, she is attacked at school by a creature that feeds on human blood. Just when all hope seems lost, a mysterious man named Haji appears and fends off the creature temporarily. But when her rescuer forces her to drink his blood, Saya suddenly enters a trance and slays the monster with ease, using her own blood as a catalyst. Saya then learns of an organization named Red Shield, founded for the sole purpose of defeating the hellish beasts. Now Saya and Haji must work together with Red Shield to fight these fearsome monsters and unlock the secrets to the girl's past.